Replacement battery A1382

Apple doesn't sell OEM batteries for that model. They don't consider it user serviceable and will only sell one as part of a battery replacement service that will also require that the previous battery be exchanged.

Mac - Assistance Apple officielle

There may be service providers in Mauritius that will do it for you. However, there's a chance that your computer is considered "vintage" and not eligible for battery service.

You can see this article for help: iPhone Battery & Power - Official Apple Support

Ultimately, you'll need to contact Apple Support directly (we're not representatives of Apple Support): Contact Apple for support and service - Apple Support